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Preparing method of surface-defect-mode-modified metal sulfide catalyst

A metal sulfide and catalyst technology, applied in the field of metal sulfide catalyst preparation, can solve problems such as difficulty in activating nitrogen molecules, and achieve the effects of improving nitrogen fixation efficiency, simple synthesis route and versatility

Active Publication Date: 2019-07-12
HUAIBEI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ultrahigh bond energy of the nitrogen-nitrogen triple bond makes nitrogen molecules exhibit stable chemical characteristics, which makes it difficult for conventional photocatalytic materials to activate nitrogen molecules.
Therefore, the development of highly efficient photocatalysts for nitrogen fixation and synthesis of ammonia still faces great challenges.

Method used

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  • Preparing method of surface-defect-mode-modified metal sulfide catalyst
  • Preparing method of surface-defect-mode-modified metal sulfide catalyst
  • Preparing method of surface-defect-mode-modified metal sulfide catalyst

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Experimental program
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Effect test

Embodiment 1

[0029] This embodiment prepares Zn deficiency-Zn according to the following steps 3 In 2 S 6 (when x=3) catalyst:

[0030] Step 1, weigh 1.5mmol of zinc nitrate, 1mmol of indium nitrate hydrate and 3mmol of cysteine ​​in a beaker filled with 60mL of deionized water, and stir to dissolve them;

[0031] Step 2, transfer the mixture in step 1 to a 100ml polytetrafluoroethylene liner, seal it, heat it with water at 200°C, and after 20 hours, wash it with deionized water and dry it in vacuum to obtain the Zn defect-Zn 3 In 2 S 6 catalyst.

[0032] Other surface defect-modified catalysts (surface defect-modified transition metal dichalcogenides (TMDs)) Zn defect-Zn x In 2 S 3+x (x=1-5) and the like can be prepared by changing the raw materials and process conditions and adopting the above-mentioned preparation method. Among them, the raw materials of metal elements are their nitrates, and the ratio of raw materials adopts the atomic composition ratio of TMDs, and other cond...

Embodiment 2

[0034] This embodiment prepares Zn-deficient ZnIn according to the following steps 2 S 4 (when x=1) catalyst:

[0035] Zn-deficient ZnIn 2 S 4 The synthesis of: 0.5mmol zinc nitrate, 1mmol hydrated indium nitrate and 2mmol cysteine; other conditions remain unchanged.

[0036] With the Zn defect-Zn in embodiment 1 3 In 2 S 6 The synthesis method of the catalyst is the same, the difference is that the input amount ratio of the raw materials is changed.

Embodiment 3

[0038] This embodiment prepares Zn-deficient Zn according to the following steps 2 In 2 S 5 (when x=2) catalyst:

[0039] Zn-deficient ZnIn 2 S 5 The synthesis of: 1mmol zinc nitrate, 1mmol hydrated indium nitrate and 2.5mmol cysteine; other conditions remain unchanged.

[0040] With the Zn defect-Zn in embodiment 1 3 In 2 S 6 The synthesis method of the catalyst is the same, the difference is that the input amount ratio of the raw materials is changed.

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Abstract

The invention discloses a preparing method of a surface-defect-mode-modified metal sulfide catalyst. The preparing method comprises the following steps of 1, weighing nitrate, hydrated indium nitrateor hydrated lanthanum nitrate or hydrated zinc nitrate, and cysteine respectively, putting the raw materials in a beaker containing deionized water, and conducting stirring and dissolving to obtain amixed solution; 2, transferring the mixed solution in step 1 into a polytetrafluoroethylene lining, conducting sealing and hydro-thermal treatment, afterwards, utilizing deionized water for washing, and then conducting vacuum drying to obtain the surface-defect-mode-modified metal sulfide catalyst. According to the catalyst, the N2 molecular reaction activity is improved, and proceeding of a nitrogen fixation reaction is promoted. The preparing method is simple and feasible in synthesis route and has universality.

Description

technical field [0001] The invention relates to a preparation method of a catalyst, in particular to a preparation method of a metal sulfide catalyst modified by a surface defect state. Background technique [0002] Semiconductor photocatalytic nitrogen fixation has attracted great attention worldwide due to its highly efficient and clean properties. Similar to biological nitrogenase, the photocatalytic process uses sunlight to excite photocatalysts that can convert N 2 reduced to NH 3 , for cleaner and more sustainable NH 3 Production offers a path to decarbonisation. Photocatalysis, which can directly convert solar energy into chemical energy, provides a very promising method for reducing the energy consumption of ammonia synthesis. However, the ultrahigh bond energy of the nitrogen-nitrogen triple bond makes nitrogen molecules exhibit stable chemical characteristics, which makes it difficult for conventional photocatalytic materials to activate nitrogen molecules. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J37/10C07C45/27C07C47/54C07D307/46
CPCB01J27/04B01J37/10C07C45/27C07D307/46B01J35/39C07C47/54
Inventor 孟苏刚郑秀珍吴惠惠付先亮陈士夫
Owner HUAIBEI NORMAL UNIVERSITY
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